S-300: Gas Detector with Sensor Head

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Product Overview

AeroQual Gas Sensor

The Series 300 Portable Ozone Monitor Base (Sensor Head Sold Seperately) is a versatile monitor with the ability to accurately measure 4 different ranges of ozone sensor as well as temperature and relative humidity, if required. It is designed for ozone monitoring and control in a variety of applications. Ozone concentrations can be displayed in either ppm or mg/m3 on the large LCD display. There are also user defined high and low alarm set points which will trigger an audible alarm when the ozone concentration exceeds the set point.

A key feature of the Series 300 Portable Ozone Monitor is the ability to operate in control mode. Upper and lower control limits can be easily set directly on the display. Using the 0-5V output the Series 300 can be used to switch on or off an externally connected device, such as an ozone generator, or system in the presence of a predetermined level of gas. By selecting the optional wall-mount bracket and plugging in mains power the Series 300 is effectively able to act as a fixed monitor as well as a handheld portable device.

For those wanting to recalibrate in the field the Series 300 allows adjustment of zero and span. Together with the R42 Calibration Accessory and an ozone generator this function allows the sensor head to be fully recalibrated without having to return it to the factory. Alternatively the sensor head can be returned to Aeroqual for a factory calibration which includes a renewed calibration certificate. For more on calibrating the Series 300 click here.

An alternative to this product is the S-500.

Monitor Quick Comparison
Portable: Yes 
Range: Multiple 
Display: LCD 
Alarm: Yes 
Outputs: Multiple 
Datalogging: No 
Indoor/Outdoor: Indoor

Optional Accessories Description
International Plug Adapter International Plug Adapter for overseas use. (no voltage converter)
C-40 Small Carrying Case Small Carry Case holds 1 Portable Monitor and 2 sensor heads
R-41 Large Carrying Case Large Carry Case holds 1 Portable Monitor and 7 sensor heads (includes shoulder strap)
RH/Temp Dongle Plug-in SHT7x Sensirion Temperature and Relative Humidity sensor
Wall Mounting Bracket The wall bracket is a light weight mounting device
Remote Sensor Kit The Remote Sensor Kit is designed for applications where the sensor needs to be separate from the monitor base.


  • Interchangeable sensor head
  • External control signals and Alarms
  • Min, Max, and Average capable
  • Can utilize sensor heads for other ranges and gases
  • Consider: Portable. Range: Multiple. Display: LCD. Alarm: Audible. Outputs: Multiple.
 More Information
Weight 1.0 lbs (0.45kg)
Electrical 12.6 VDC
Dimensions 7.7 x 4.8 x 2.1 inches (19.5 x 12.2 x 5.4 cm)
Warranty 1 Years
Display Digital
Detection Method HMOS
Temperature Range 23 to 122°F (-5 to 50°C)
Accuracy +/- 100%, dependent on sensor
Resolution 0.0 ppm (0.0 ppb)
Supporting Documents User Manual included (NIST Traceable Calibration Sheet with each head)
Alarm Audible and Visual High and Low alarm setpoints
Has Battery Yes rechargeable, replaceable Lithium Ion battery
Humidity Range 5 to 95%
Internal Datalogging No
Display Units ppm
Communication Protocol None
Relays 1
Multi-Gas Capable Yes. See chart above for Ozone options.
Sensor Head Included No

S-300 User Guide
S-300 User Guide

Warranty Information

Seller warrants that all Products will conform to the Specifications and will be free from defects in material workmanship and programming. Claims for Products not complying with this warranty shall be submitted by Buyer no later than 12 months from delivery date to Buyer. Seller shall promptly repair or replace, at its option and expense, non-complying Products. The shipment of non-complying Products by Buyer to Seller, and the return shipment of repaired or replacement Products by Seller to Buyer shall be at Seller's expense, unless it shall be determined that Buyer returned a Product that was in compliance, in which case such cost shall be borne by Buyer and, if paid by Seller, these expenses shall be reimbursed by Buyer within thirty (30) days of notice by Seller. Buyer shall receive a credit for any non-complying Products returned for repair or replacement. All non-complying Products shall be returned to Seller (at its offices or as otherwise instructed) no later than 30 days as of the date the non-compliance of any such Product has been discovered. Seller is NOT responsible for any/all damages suffered to the Products that is caused by the Buyer. Such as but not limited to damage by wrong electrical current, damage through crush or dropping the product, damage through untrained users of Product, damage through improper operations.